Valve-stem lock



Oct. 21, 1930. J RENFER 1,779,108

VALVE STEM LOCK Filed March 13, 1929 ammo Patented Oct. 21, 1930 UNITEDSTATES v PATENT -o-1=;F1;E1,

JOHN E. RENFER, or CLEVELAND, omo, ASsI NOR To THE CLEVELAND noox DRILLCOMPANY, or CLEVELAND, OHIO v a VALVE-STEM Locx Application filed March13, 1929. Serial Ho. 346,662.

The present invention is directed to improvements in valve stem locks.

The primary object of the invention is to provide a device of thischaracter so constructed that a valve stem can be held positivelyagainst longitudinal movement, but may be freely rotated when desired.

Another object of the invention is to provide a device of this kindprimarily designed for use in connection with the valve of a rock drill,but not necessarily limited to such use. I VViththese and other objectsin view, as will appear as the description proceeds, the inventionaccordingly consists in the novel features of construction andarrangement of parts to be hereinafter fully described and pointed outin the appended claims.

In the accompanying drawing, in which similar characters of referencedenote like and corresponding parts throughout the several views thereofFigure 1 is a sectional view through the valve chest of a rock drill,illustrating the application of this invention. I

Figure 2 is an end elevation of the valve.

Figure 3 is a section taken on the line 3-3 of Figure 1.

Figure 1 is a view partly in elevation and partly in section of amodified form of the invention.

Figure 5 is a section taken on the line 5-5 of Figure l.

Referring to the drawing, 1 designates a portion of a drill cylinder inwhich is reciprocable the piston hammer 2, the movement of which iscontrolled by the spoolvalve '3 in the manner disclosed in the patent toGustave M. Nell, No. 1,603,705 issued October 19, 1926.

i It is desired at times to hold the hammer and valve in such positionsthat a continuous blast of air will pass through the drill steel to blowthe cuttings from the hole being drilled, and in order to accomplishthis the 6 provided with an axial counter-bore7 in shank 4 has its rearendformedwith a head ner in which the shank co-operates with the portsofthe drill is not deemed-necessary.

The head- 6 fits in one end of the valve chest 9, thebore 7 thereofhavingfopeninq thereinto a slot 10 formed transversely of sald head. Theshank is provided with an annular-groove 11 and a handle 12, saidhandlecarrying a spring pressed latch 13 for .selectivefengagement withtherecesses ltand 15Yform ed in the adjacent face of the head Gin 'orderthatthe stem can be held positively in; adjusted positions. A

ing plate 16 having a circular seat17 and resultant extensions 18:adapted to enter the groove 11 to prevent longitudinal movement of theshank 8,b"ut permitting rotation thereof when desired. I v

l The outer endiof the plate 16 isextended from the slo't'lO asufficient distance to engage Removably ag d in the slot .10 is a lockia boss 19 or any other. adjacentipart of the drill body to preventaccidental disengagement of the plate fromthe slot. Obviously the platecan be readily removed when the drill is disassembled.

In the modified form of the invention the head 6 is provided withdiametrically opposed slots 20 for receiving the locking plates 21, saidhead having an exterior annular groove 22. The plates 21' have theirouter ends curved, as at 23, in order that they will lie in a plane withthe groove 22 so that when the split resilient ring 24 is snapped in thegroove 22 it will engage the outer ends of the plates and hold the sameinterlocked in the Since annular groove 11 of. the shank 8. the ring canberemovedand replaced, the plates 21 may be easily and quickly appliedor removed. V r

From the foregoing, it is thought that the operation and many advantagesof the herein described invention will be apparent to those skilled inthe art without further description, and it willbe of course understoodthat the shape and proportions may be changed or varied, and minordetails in constructlon may be resorted to without departure from, I

the spirit of the invention.

What is claimed is 1. The combination with a valve chest, of

a shank therein, a spool valve slidable on the shank, said shank havinga head provided with an axial bore, a valve stem rotatable in the bore,and a locking plate rcmovably engaged in the head and havinginterlocking engagement with the stem, as and for the purpose set forth.

2. The combination with a valve chest, of a shank fixed therein, a spoolvalve slidable on the shank, said shank having a head upon one end andfitted in the end of the chest, said head having an axial bore, a Valvestem rotatable in the bore and having an annular groove formed therein,a locking plate mounted in the head and having engagement with thegroove, said plate serving to prevent longitudinal movement of the stem,but permitting free rotation thereof.

3. The combination with a valve chest, of a shank fixed therein, a valvemovable thereon, said shank having a head upon one end and fitted in thechest, said head having a transverse slot formed therein, a valve stemrotatable in the head and having an annular groove therein, a lockingplate removably mounted in the slot for engagement with the stem.

4. The combination with a valve chest, of a shank fixed therein, a valvemovable on the shank, said shank having a head for engagement in one endof the chest, a valve stem rotatable in the head, locking plates carriedby the head and having interlocking engagement with the stem, meanssupporting the chest and engaged with the plates for holding the sameengaged in the head.

In testimony whereof I aliiX my signature.

' JOHN E. RENFER.

